OK, the dyno pulls have been made! And we have a winner on torque. Yours truly nailed the peak torque EXACTLY!
Drum roll.................................678.4 ft. lbs. at 3500 rpm, and 615.5 HP @ 5700.
It made 557.3 Ft. Lbs @ 2400 RPM! Made over 600 Ft. Lbs. from 2700 rpm to 5300 rpm. It made 670 or better from 3300-4100 rpm.
The lowest torque was 438 ft. lbs @ 6700 rpm.
It made over 500 HP from 3900-6700 which was the end of the pull, where it still made 556 HP.
It made over 600 HP from 5200-6100 rpm.
The lowest HP was 257 @ 2400.
I'm sure it's capable of a fair amount more as we ran it with a customers 4150 Holley carb on an RPM intake. I think with a Victor intake, and this carb re-jetted, it would have probably been in the 650-675 HP range. Probably up around 700 ft. lbs. also. The engine is going to be fuel injected in the car, so we saw no reason to re-jet this carb and keep flogging it to find an absolute peak power. We mainly wanted to get it running, re-lash it hot, make sure all is well, and see what it likes for timing. It liked 37° total. At 35°, it made 607 HP, and at 39°, it made 607 HP, but when I got it at 37° it made 615.5 HP. A/F ratio was a tad lean, probably could have used a couple sizes bigger jet, but all in all, it ran great. Absolutely no smoke or oil coming out the open breathers, nor did any oil come shooting out of the dipstick tube! LOL! Sounds pretty damn good. I will post some videos on you tube later.
I'm not sure why I'm so good at guessing torque of engines, but when we dyno engines, I'm almost always within a few ft. lbs. of what they do. I'm usually within 10-20 HP also. This time not. But the last two engines we dynoed, I nailed the torque exactly. I look at the engine and the specs, and numbers pop into my head. I found in the past, when I deviate from those numbers, I end up wrong, so I stick with them, and usually right. When I told my customer 678 Ft. lbs. he said he thought that was low, and that he thought around 700. I said, I'm sticking with my 678 because I found to always trust my initial instinct. Now to dial in those HP number a little closer!
Koerner Racing Engines
I was wrong once. That was when I THOUGHT I made a mistake!
Your mind determines your limits!